The study was set to find out the effect of problem-solving method on the performance of secondary school students in Commerce in Kaduna State. Two objectives, research questions, and hypotheses were postulated. These include determining the effect of Problem-solving method on the performance of secondary school students in commerce in Kaduna State, Nigeria. Establish the difference in performance between male and female secondary school students taught Commerce using Problem-solving method in Kaduna State, Nigeria. What is the effect of problem-solving teaching method on the performance of secondary school students taught Commerce in Kaduna State, Nigeria? What is the difference in performance of male and female secondary school students taught Commerce using problem-solving teaching method in Kaduna State, Nigeria? Cooperative teaching method has no significant effect on the performance of secondary school students taught Commerce in Kaduna State, Nigeria. There is no significant difference between the performance of male and female secondary school students taught Commerce using problem-solving teaching method in Kaduna State, Nigeria.